Ultrasensitive fluorescent aptasensor for CRP detection based on the RNase H assisted DNA recycling signal amplification strategy
| Autor: | Fangling Ren, Wei Chen, Zhongzhi Liu, Dan Luo, Qinhua Chen, Bingqiang Zhang, Fengying Ran, Ceming Wang, Jian Wei, Hao Chen |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Detection limit
chemistry.chemical_classification biology Chemistry General Chemical Engineering Aptamer RNA 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Fluorescence Molecular biology 0104 chemical sciences chemistry.chemical_compound biology.protein Nucleotide 0210 nano-technology RNase H Signal amplification DNA |
| Zdroj: | RSC Advances. 9:11960-11967 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c9ra01352k |
| Popis: | An aptamer-based method for the ultrasensitive fluorescence detection of C-reactive protein (CRP) was developed using the ribonuclease H (RNase H) assisted DNA recycling signal amplification strategy. In this assay, CRP can specifically bind to the aptamer of CRP and the DNA chain of P1 is released from the aptamer/P1 (Ap/P1) complexes. After the addition of the fluorescence labeled (5-FAM) RNA, P1 hybridizes with fluorescence labeled RNA to form a P1/RNA double strand. When RNase H is added, the RNA with fluorescence labeling in the double strand is specifically cut into nucleotide fragments, which cannot be adsorbed on the surface of the GO, so as to generate a fluorescence signal. In the absence of CRP, fluorescence labeled RNA cannot hybridize with P1 to form double strands, which is able to directly adsorb on the surface of GO, resulting in no fluorescence signal. The detection limit is as low as 0.01 ng mL−1, with a linear dynamic range from 50 pg mL−1 to 100 ng mL−1. This sensor is able to detect CRP in spiked human serum, urine and saliva. Thus, it shows a great application prospect in disease diagnosis and prognosis. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|